Independent analysis puts a QYB liraglutide lot at 96.9%, against 96.0% on the certificate
The result is unremarkable. What the report omits is not.
Analytics in 2025
Page 9 of 11 of this archive, newest first.
Independent analysis puts a Homopeptide mazdutide lot at 99.2%, against 98.5% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
PeptideMeter result on a Xi'an dulaglutide lot lands 2.6 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
A method is a set of numbers. All of them belong on the certificate.
Column chemistry, particle size and pore diameter determine what the separation is capable of before the gradient is even programmed.
VendorInvestigate result on a Hangzhou dulaglutide lot lands 2.2 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
When a better instrument changes the answer rather than the confidence
Calibration drift is real, unremarkable, and the reason serious laboratories run internal standards.
Medutest result on a Wuhan orforglipron lot lands 3.1 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Independent analysis puts a HJ exenatide lot at 98.4%, against 97.3% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Three services, one lot, and a spread of two and a half points
Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.
VendorInvestigate result on a Hong Kong retatrutide lot lands 2.9 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
Independent analysis puts a MKM liraglutide lot at 96.2%, against 94.9% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Why a dead-clean sterile filter can pass pyrogen straight through
Three compendial method families are in routine use and a fourth, based on a recombinant enzyme rather than crab lysate, is now compendial in its own right.
PeptideMeter result on a Hangzhou exenatide lot lands 3.5 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
Independent analysis puts a WWB exenatide lot at 98.5%, against 96.6% on the certificate
The result is unremarkable. What the report omits is not.
Medutest result on a Nantong orforglipron lot lands 2.6 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
The change that weighs nothing at all
What would be needed to catch each of these, and what it would cost.
Independent analysis puts a GGPeps retatrutide lot at 95.3%, against 92.8% on the certificate
The result is unremarkable. What the report omits is not.
PeptideMeter result on a Wuxi cagrilintide lot lands 2.5 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
Janoshik result on a Zhuhai liraglutide lot lands 1.0 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
A tested vial is evidence about a vial
A result on one vial generalises to a batch only if the vial was drawn in a way that makes it representative — and nobody records how it was drawn.